Tolidis K1, Dionysopoulos D1, Gerasimou P1, Sfeikos T1.
1Department of Operative Dentistry, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki – Greece.
The purpose of this investigation was to evaluate the influence of radiant heat and ultrasound on fluoride release and surface hardness of 3 glass ionomer cements (GICs).
There were 3 experimental groups for each GIC; in group 1, the specimens were left to set without any treatment; in group 2, the specimens were irradiated for 2 minutes using a LED unit; and in group 3, ultrasound was applied using a scaler for 55 seconds on the specimen surface. Fluoride release measurements were performed daily for 7 days and at days 14 and 28. Surface hardness of the tested GICs was determined using Vickers method. The measurements were performed 24 hours and 7 days after mixing. Statistical analysis of the data was made using 1-way ANOVA and Tukey’s and Bonferroni post hoc tests (α = 0.05).
Radiant heat during setting reduced the fluoride release and increased the surface hardness of GICs (p<0.05). Ultrasonic treatment also reduced the fluoride release and increased the surface hardness (p<0.05) of GICs but in lower extent. Among the GICs there were differences in fluoride release and surface hardness properties depending on their composition (p<0.05).
Radiant heat and ultrasonic treatments may be useful methods for GIC restorations in order to achieve faster adequate initial mechanical properties.
PMID: 27311425 [PubMed – as supplied by publisher] 1. J Appl Biomater Funct Mater. 2016 Jun 3:0. doi: 10.5301/jabfm.5000292. [Epub ahead of print]